Product Description
4-Arm PEG-glutamic acid (4-arm PEG-GA) is a multiarm PEG derivative with carboxylic acid 聽groups at each terminal of the 4聽arms connected to one pentaerythritol core.聽There is a C3聽 hydrocarbon ester between PEG and the glutamic聽acid COOH group. PEG acid can be used to react with amine groups with peptide coupling reagents such as NHS and DCC, EDC.